Passive infra-red sensor



FIG. 1 is a perspective view of a passive infra-red sensor showing ournew design;

FIG. 2 is a reduced side elevational view taken from the right of FIG.1;

FIG. 3 is a reduced rear elevational view thereof;

FIG. 4 is a reduced bottom plan view thereof;

FIG. 5 is a reduced front elevational view thereof;

FIG. 6 is a reduced side elevational view taken from the left of FIG. 1;

FIG. 7 is a reduced bottom plan view thereof.

The ornamental design for a passive infra-red sensor, as shown anddescribed.